A doré bar is a semi-pure alloy of gold and silver. It is usually created at the site of a mine and then transported to a refinery for further purification.
The proportions of silver and gold can vary widely. Doré bars weigh as much as 25 kg.
During the 19th century gold rushes, gold nuggets and dust were melted into crude gold bars mistakenly called "bullion" by miners. They were, more accurately, doré bars with higher contents of silver and other adulterants than the mints would accept. Mint and private assayers would subsequently refine the doré bars to an acceptable purity, 999 fine, gold bullion, with the silver and base metals removed. By the time of the California gold rush, mints were moving away from the age-old process of cupellation to "part" bullion and moving toward the acid refining process developed by chemist Joseph Louis Gay-Lussac for the French mint. By the time of the Klondike gold rush, mints were replacing Gay-Lussac's acid process and introducing electrolysis to refine doré bars into 999.9 purity gold bullion.[1]
According to the United States Census Bureau,[2] the creation of doré bars is conducted at establishments engaged either in "Gold Ore Mining" (NAICS Code 212221),[3] or "Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum)" (NAICS Code 331419).[4]
Derivation of the termEdit
The word doré is French for "gilded" or "golden".[5]
^Metallurgy of Gold, Silver, Lead and Zinc. Scranton, Pennsylvania: International Correspondence Schools. 1902. pp. 87–91. Retrieved 3 April 2020.
^"US Census Bureau". Census.gov. Retrieved 5 December 2018.
^"2002 NAICS Definitions: 212221 Gold Ore Mining". Archived from the original on 21 April 2003.
^"2002 NAICS Definitions: 331419 Primary Smelting and Refining of Nonfe…". Archived from the original on 21 December 2002.
^. Archived from the original on 2007-10-07. Retrieved 2007-01-02.
External linksEdit
Ore Processing from mine to Doré production, from Newmont Waihi
Categories of gold bar: 'Dore' Bars
August 28, 2023
doré, this, article, multiple, issues, please, help, improve, discuss, these, issues, talk, page, learn, when, remove, these, template, messages, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations. This article has multiple issues Please help improve it or discuss these issues on the talk page Learn how and when to remove these template messages This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Dore bar news newspapers books scholar JSTOR December 2018 Learn how and when to remove this template message This article includes a list of general references but it lacks sufficient corresponding inline citations Please help to improve this article by introducing more precise citations April 2009 Learn how and when to remove this template message Learn how and when to remove this template message A dore bar is a semi pure alloy of gold and silver It is usually created at the site of a mine and then transported to a refinery for further purification The proportions of silver and gold can vary widely Dore bars weigh as much as 25 kg During the 19th century gold rushes gold nuggets and dust were melted into crude gold bars mistakenly called bullion by miners They were more accurately dore bars with higher contents of silver and other adulterants than the mints would accept Mint and private assayers would subsequently refine the dore bars to an acceptable purity 999 fine gold bullion with the silver and base metals removed By the time of the California gold rush mints were moving away from the age old process of cupellation to part bullion and moving toward the acid refining process developed by chemist Joseph Louis Gay Lussac for the French mint By the time of the Klondike gold rush mints were replacing Gay Lussac s acid process and introducing electrolysis to refine dore bars into 999 9 purity gold bullion 1 Contents 1 Associated industry codes 2 Derivation of the term 3 See also 4 References 5 External linksAssociated industry codes EditAccording to the United States Census Bureau 2 the creation of dore bars is conducted at establishments engaged either in Gold Ore Mining NAICS Code 212221 3 or Primary Smelting and Refining of Nonferrous Metal except Copper and Aluminum NAICS Code 331419 4 Derivation of the term EditThe word dore is French for gilded or golden 5 See also EditBullion Bullion coin Electrum Gold bar Gold extraction Gold mining Ore genesis SmeltingReferences Edit Metallurgy of Gold Silver Lead and Zinc Scranton Pennsylvania International Correspondence Schools 1902 pp 87 91 Retrieved 3 April 2020 US Census Bureau Census gov Retrieved 5 December 2018 2002 NAICS Definitions 212221 Gold Ore Mining Archived from the original on 21 April 2003 2002 NAICS Definitions 331419 Primary Smelting and Refining of Nonfe Archived from the original on 21 December 2002 Dore Dictionnaire Francais Anglais WordReference com Archived from the original on 2007 10 07 Retrieved 2007 01 02 External links EditDore Bullion Ore Processing from mine to Dore production from Newmont Waihi Photograph of a dore bar weighing 17 42 kg Categories of gold bar Dore Bars Retrieved from https en wikipedia org w index php title Dore bar amp oldid 1111703995, wikipedia, wiki, book, books, library,
